langeehe



, (No ModeL) H. G. .LANGREHR. Fog Horn.

N0. 239,613. Patented April 5,1881;

WITNESSES INVENTEIR /6m 4 A w d m fi QWW/M. f IMO/W" jmm MPETERS.PNOTO-UTHOG APMER WASHINGTON O 0 UNITED STATES PATENT OFFICE.

HENRY G. LANGREHR, OF SAN FRANCISCO, CALIFORNIA.-

FOG-HORN.

SPECIFICATION forming part of Letters Patent No. 239,613, dated April 5,1881.

Application filed December 22, 1880. (No model.)

To all whom it may concern Be it known that I, HENRY O. LANGREHR, acitizen of the United States, and residing at San Francisco, in thecounty of San Francisco and State of California, have invented certainnew and useful Improvements in Fog-Horns; and I do hereby declare thefollowing to be a full, clear, and exact description of the same,reference being had to the drawings which are hereunto annexed, and inwhich- Figure 1 is a perspective view of my improved fog-horn. Fig. 2 isa plan view of the reed. Fig. 3 is a cross-section of thesemi-cylindrical tube, looking toward the closed end. Fig. 4 is alongitudinal sectional View, a portion of the bell being shown as brokenaway.

Similar letters of reference are used to designate like parts throughoutthe several views.

My invention relates to an improved foghorn of that class used as adangersignal on sailing-vessels in foggy weather, and is intended as animprovement upon the device for which Letters Patent of the UnitedStates were granted to Ezra T. Bucknam and Henry (J. Langrehr, numbered215,433, and dated May 20, 1879.

My present invention consists of certain details of construction andoperation which will hereinafter more fully appear.

In the drawings hereunto annexed, A represents the bell or tube of thefog-horn, and B the mouth-piece thereof. A flange or shoulder,O,isformed at the smaller end of this bell or tube. Forming part of thisshoulder or flange and projecting above it is a male screwthread,D, asshown. Projecting upward from this male screwthread is a taperingsemi-cylindrical tube, E, the upper end of which is closed in the mannershown.

At the base of the tube E, on the open side thereof, and in thethickness of metal compos ing the male screw-thread D, I form a slot, F,to receive the base or lower end of the reed G, the upper end of whichprojects slightly above the top of the tube E, so that the compressedair in the mouth-piece may the more readily move it.

The mouth-piece B is made cylindrical in cross-section and tapering, asshown, for convenience in use. This mouth-piece has threads on its innersurface, so that the mouth-piece B may be screwed onto the screw-head Dso as to inclose the semi-cylindrical tube and reed G. The lower end ofthe mouth-pieceis flanged over to inclose the flange 0 upon the horn orbell A, forming an air-tight joint, so that the mouth-piece forms achamber which incloses the tube E and reed Gr.

Upon the inner surface of the mouth-piece I form an annular flange,H,which binds upon the shoulders I I, formed near the base of the reedG, and holds it down to its proper position in the slot F,thusdispensing with screws, rivets, or other contrivances for holding thereed in place.

The reed G is constructed of sheet metal and of the form shown in Fig.2, and is made flexible and so set as to leave a small space between itand the open side of the semi-cylindrical tube E.

The reed and tube combination, with flanges and screw-threads, are madeof cast-brass or other metal, and are brazed to a horn of sheetbrass,tin, or copper.

The advantages claimed for this device are great simplicity ofconstruction, thereby reducing the cost of manufacture to a minimum, andgreat increase of power, owing to the peculiar construction of the tubeE.

I am awareihat horns have been made heretofore with a removablemouth-piece surrounding the reed, and also that horns have heretoforebeen made with reeds removable from the tubes, and hence I do not claimthese features broadly; but,

Having thus described my invention, what I claim, and desire to secureby Letters Pat cut, is-

The removable mouth-piece B, provided with an annular flange, II, andsemi-cylindrical tapering tube E, in combination with the reed Gr,having shoulders I I, all constructed and arranged to operatesubstantially as and for the purpose specified.

In testimony that I claim the foregoing I have hereunto set my hand andseal this 10th day of December, 1880.

HENRY (J. LANGREHR.

Witnesses O. W. M. SMITH, WILLIAM HARNEY.

